Modifica espansione di banda per Alinco DJ-280

[RADIOMOD]

    
Expanded transmit for the Alinco DJ-280T   
          

I have found some mods for the Alinco DJ-280 which I have found to work well. I have not yet tried everything yet and it is up to you to do what a ham does best "tinker".

First remove the battery and battery contact plate on the bottom of the radio.

Second remove the 3 screws on the radio case, 2 on the back next to the PTT and 1 on the front next to the lanyard hole. There is no need to remove the belt clip or the plate under the belt clip.

Three remove the squelch knob and the off/vol knob, take of the front half of the case (be careful there are 2 small wiring harnesses between the 2 halves of the case) by swinging the bottom out and lifting up. Then unclip the 2 wiring harnesses, 1 from the speaker and the other from the keypad.

Now looking at the board you will see 5 solder jumper spots on the left side of the radio. Two of the on the top going horizontal, and three jumpers going vertical. The 3 going vertical are the ones to use, I have not worked with the other two yet.

I have solder blobs on TRX and TX, which gives me the standard US band plan TX 222 Mhz- 224.995 Mhz.

Which is model DJ-280T

          TX jumper  CLOSED

          RX jumper  OPEN

          TRX jumper CLOSED

By opening the TRX jumper and closing the RX jumper it will now work on 220 Mhz- 239.995 Mhz. Which is model DJ-280TA1

          TX  jumper CLOSED

          RX  jumper CLOSED

          TRX jumper OPEN

By closing all jumper it will work on 240 Mhz- 259.995 Mhz. Which is model DJ-280TA2

          TX jumper  CLOSED

          RX jumper  CLOSED

          TRX jumper CLOSED


     
Expanded recieve for the Alinco DJ-280T


To extend the Recieve, press and the LAMP button while powering the unit. The recieve will be extented to 200-299 MHz. Once the TX expand has been done, it will show TX from the same range.

Mine transmits from 200 - 272.4 It does show trx above that, but its 272 MHz so maybe it can be increased.